The Supreme Court on Monday will hold oral arguments concerning the global reach of U.S. copyright law, in a case testing whether an overseas purchaser of a copyrighted work may resell it in the United States without the copyright holder's permission. The case tests the so-called "first-sale" doctrine, which generally allows the purchaser of any copyrighted work to re-sell or use the work without the copyright holder's permission. That's why used bookstores, libraries, GameStop, video rental stores and even eBay are all legal. But how the doctrine applies to foreign-purchased works -- the so-called grey market -- has been a matter of considerable debate. And the lower courts are conflicted.